<?php
// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>. 
//
// This file was modified by contributors of "BOINC Web Tweak" project.

// Scale an image using the most powerful GD software available on the server
// while keeping aspect ratio the same
//
function intelligently_scale_image($sourcefile, $fw, $fh) {
	$gd_info = gd_info();
	$newGD = (strstr($gd_info["GD Version"], "2.0")!="");

	list($ow, $oh, $from_type) = getimagesize($sourcefile);
	switch($from_type) {
	case 1: // GIF
		$srcImage = imageCreateFromGif($sourcefile);
		break;
	case 2: // JPG
		$srcImage = imageCreateFromJpeg($sourcefile);
		break;
	case 3: // PNG
		$srcImage = imageCreateFromPng($sourcefile);
		break;
	}

	$tempw = $fw;
	$temph = number_format((($oh*$fw)/$ow), 0);

	if($temph < $fh) {
		$tempw = number_format((($ow*$fh)/$oh), 0);
		$temph = $fh;
	}

	if ($newGD){
		$tempImage = imageCreateTrueColor($tempw, $temph);
		// Seems not to work:
		// imageAntiAlias($tempImage, true);
		imagecopyresampled($tempImage, $srcImage, 0, 0, 0, 0, $tempw, $temph, $ow, $oh);
	} else {
		$tempImage = imageCreate($tempw, $temph);
		imagecopyresized($tempImage, $srcImage, 0, 0, 0, 0, $tempw, $temph, $ow, $oh);
	}


	// Calculate offsets
	if($temph < $fh) {
		$offsety = number_format(($temph/2)-($fh/2), 0);
		$offsetx = 0;
	} else {
		$offsety = 0;
		$offsetx = number_format(($tempw/2)-($fw/2), 0);
	}

	if ($newGD){
		$destImage = imageCreateTrueColor($fw, $fh);
		// Seems not to work:
		// imageAntiAlias($tempImage, true);
		imagecopyresampled($destImage, $tempImage, 0, 0, $offsetx, $offsety, $fw, $fh, $fw, $fh);
	} else {
		$destImage = imageCreate($fw, $fh);
		imagecopyresized($destImage, $tempImage, 0, 0, $offsetx, $offsety, $fw, $fh, $fw, $fh);
	}

	return $destImage; //imageJpeg($destImage, $destfile, $jpegquality);
}

?>
